package filters;

import helpers.UrlHelper;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;

import entities.User;

import models.UserModel;

public class AuthFilter implements Filter {
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse resp = (HttpServletResponse) response;
		
		//Check permission
		if (req.getUserPrincipal() == null) {
			UserService userService = UserServiceFactory.getUserService();
			String thisURL = req.getRequestURI();
			String url = userService.createLoginURL(thisURL);
			resp.sendRedirect(url);
			return;
		}
		
		String username = req.getUserPrincipal().getName();
		UserModel userModel = UserModel.getInstance();
		User user = userModel.getUser(username);
		if (user == null) {
			resp.sendRedirect("/register");
			return;
		}

		chain.doFilter(request, response);
	}

	public void destroy() {

	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
	}

}
